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Why performance of Vulkan is so poor ?

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  • Why performance of Vulkan is so poor ?

    Hello. I'm facing the trouble I have a poor FPS with Unreal Engine 4 when in uses Vulkan target.

    So with same hardware stuff and same scene I have:
    Windows 10 = 100 FPS (+/- 5)
    Ubuntu 18.04 (KDE Neon) with OpenGL4 target = 85-90 FPS
    Ubuntu 18.04 (KDE Neon) with Vulkan taget = 25-35 FPS

    The main question: why is so big difference beetween OpenGL 4 and Vulkan ?

    Here is my environment:
      PROCESSOR:          Intel Core i7-8550U @ 4.00GHz
        Core Count:       4                                        
        Thread Count:     8                                        
        Extensions:       SSE 4.2 + AVX2 + AVX + RDRAND + FSGSBASE
        Cache Size:       8192 KB                                  
        Microcode:        0xb4                                     
        Scaling Driver:   intel_pstate powersave                   
      GRAPHICS:           NVIDIA GeForce 930MX 2GB
        Frequency:        954/1001MHz      
        OpenGL:           4.6.0            
        Vulkan:           1.1.102          
        Display Driver:   NVIDIA 430.50    
        Screen:           1920x1080        
      MOTHERBOARD:        HP 837D
        BIOS Version:     Q85 Ver. 01.02.05                             
        Chipset:          Intel Xeon E3-1200 v6/7th                     
        Audio:            Conexant CX8200                               
        Network:          Realtek RTL8111/8168/8411 + Intel 8265 / 8275
      MEMORY:             8192MB
      DISK:               1000GB HGST HTS541010B7
        File-System:      ext4             
        Mount Options:    relatime rw      
        Disk Scheduler:   MQ-DEADLINE      
      OPERATING SYSTEM:   neon 18.04
        Kernel:           5.0.0-31-generic (x86_64)                                                                                   
        Desktop:          KDE Plasma 5.17.0                                                                                           
        Display Server:   X Server 1.19.6                                                                                             
        Compiler:         GCC 7.4.0 + Clang 6.0.0-1ubuntu2                                                                            
        Security:         l1tf: Mitigation of PTE Inversion; VMX: conditional cache flushes SMT vulnerable                            
                          + mds: Mitigation of Clear buffers; SMT vulnerable                                                          
                          + meltdown: Mitigation of PTI                                                                               
                          + spec_store_bypass: Mitigation of SSB disabled via prctl and seccomp                                       
                          + spectre_v1: Mitigation of usercopy/swapgs barriers and __user pointer sanitization                        
                          + spectre_v2: Mitigation of Full generic retpoline IBPB: conditional IBRS_FW STIBP: conditional RSB filling
    $ nvidia-smi
    Thu Oct 17 13:50:38 2019       
    | NVIDIA-SMI 430.50       Driver Version: 430.50       CUDA Version: 10.1     |
    | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
    | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
    |   0  GeForce 930MX       Off  | 00000000:01:00.0 Off |                  N/A |
    | N/A   47C    P0    N/A /  N/A |    506MiB /  2004MiB |     14%      Default |
    OpengGL and Vulkan info:
    OpenGL version string: 4.6.0 NVIDIA 430.50
    Vulkan Instance Version: 1.1.114
    I want be sure that it is not fail exactly of UnrealEngine4.
    I should know whose that issue: Nvidia, Khronos or Epic ?

    So I should to make detailed benchmark for OpenGL4 and Vulkan with my staff, how I can do it correctly?
    Any ideas? (Or maybe somebody know what I'm doing wrong? Why Vulkan have a so poor perfomance?).

    Please, help.